Contrôle tectonique de la sédimentation dans le système de bassins d'avant-pays de la Meseta marocaine

The Moroccan Hercynides

“…Eastward, beyond the Smaala-Oulmes fault, the AKB is marked by an important tectonic activity, especially at its eastern margin. Here, the olistostromes that were deposited have been related (i) to the emplacement of gravity-driven nappes gliding toward the AKB from its eastern uplifted margin (Huvelin, 1977;Allary et al, 1976;Bouabdelli, 1989;Jenny and Le Marrec, 1980;Jenny et al, 1989), (ii) to some extension faults (Beauchamp and Izart, 1987;Izart et al, 2001b;Verset, 1988;Berkhli et al, 2000), or (iii) to the dislocation of shelves by extension faults at the nose of a duplex complex moving from east to west during the Visean-Namurian (Benabbou, 2001a,b;Benabbou et al, 2001). A mafic magmatism accompanied the development of these basins.…”

“…Its depocentre migrated toward the west, in the Fourhal basin, which was attained during the Namurian-Westphalian (Bouabdelli and Piqué, 1996). Propagating folds in a duplex system (Benabbou et al, 2001) may have play a role in this deformation migration. In the southern part of the Fourhal Basin, the pre-Visean (Neoproterozoic to Ordovician) rocks of the ''Zaian block'' display N-S folds (Fig.…”

“…5). This can be interpreted: (i) as the result of a polyphased deformation; the SE facing structures are more recent since they affected the Upper Westphalian rocks, which are discordant upon NW vergent folds (Razin et al, 2001); (ii) as a change in the dip of the deep structures that controlled the deformations (Cailleux, 1987); or (iii) as antithetic folds and thrusts in a globally NW facing regional structure (Bensahal, 2001;Benabbou, 2001a,b;Benabbou et al, 2001).…”

Clinopyroxene trace element compositions of cumulate mafic rocks and basalts from the Hercynian Moroccan Central Meseta: Petrogenetic implications

“…Cawthorn, 2007). In the Moroccan Central Meseta (MCM), the Variscan orogeny is underlined by the development of Visean-Namurian foreland basins (Piqué et al, 1993;Bouabdelli and Piqué, 1996;Ben Abbou et al, 2001;Roddaz et al, 2002;Bennouna et al, 2004). In these basins, the deposition of sedimentary series is accompanied by the emplacement of an abundant basic magmatism (basaltic flows and basic veins) (Hoepffner, 1982;Kharbouch et al, 1985;Kharbouch, 1994;Aarab, 1995;Essaifi, 1997;Remmal et al, 1997;Remmal, 2000;Ben Abbou, 2001;Roddaz et al, 2002;Ntarmouchant, 2003) and also minor acid magmatism (Ntarmouchant, 2003;Dahire et al, 2002).…”

Reply to the Comment on “The Moroccan Hercynides” by Roddaz M., Soula J.-C., Ben Abbou M., Brusset S., Debat P., Ntarmouchant A., Driouch Y., Béziat D.

“…Accordingly the hypotheses presented by Roddaz et al (2002) have not been overlooked, and they have been quoted in several places in the text (e.g. Benabbou, 2001;Benabbou et al, 2001;Roddaz et al, 2002;N'tarmouchant, 2003) and their model presented in a figure. Therefore we reject the assertion that we neglected their important contributions.…”